file1     file2
---------------------------------------
    x      x    /              
    x      x    /ext_link_dset1
    x      x    /ext_link_dset2
    x      x    /ext_link_grp1 
    x      x    /ext_link_grp2 
    x      x    /ext_link_noexist1
    x      x    /ext_link_noexist2

group  : </> and </>
0 differences found
external link: </ext_link_dset1> and </ext_link_dset1>
dataset: </ext_link_dset1> and </ext_link_dset1>
0 differences found
0 differences found
external link: </ext_link_dset2> and </ext_link_dset2>
dataset: </ext_link_dset2> and </ext_link_dset2>
0 differences found
0 differences found
external link: </ext_link_grp1> and </ext_link_grp1>
group  : </ext_link_grp1> and </ext_link_grp1>
0 differences found
0 differences found
external link: </ext_link_grp2> and </ext_link_grp2>
group  : </ext_link_grp2> and </ext_link_grp2>
0 differences found
0 differences found
Warning: </ext_link_noexist1> is a dangling link.
Warning: </ext_link_noexist2> is a dangling link.
EXIT CODE: 2